<div id="sider">
	<ul>
		<li><a href="<?echo base_url();?>index.php/admin" <?if($ac=="user"){?>class="active"<?}?>>User Manage</a></li>
		<li><a href="<?echo base_url();?>index.php/admin/group" <?if($ac=="group"){?>class="active"<?}?>>Group Manage</a></li>
		<li><a href="<?echo base_url();?>index.php/admin/essay" <?if($ac=="essay"){?>class="active"<?}?>>Essay Manage</a></li>
		<li><a href="<?echo base_url();?>index.php/admin/oral" <?if($ac=="oral"){?>class="active"<?}?>>Oral Manage</a></li>
	</ul>
</div>